DC Power for
Business-Critical Continuity™
NetSure® DCS 48375
DC-DC Converter System
Key Features
nModular design — provides for system
redundancy and easy expansion of
operating capacity in small increments
Compact, cost effective, modular design, ideal for
+24 VDC applications requiring -48 VDC output.
nCompact shelf — 23" and 19" mount
versions
nExpandable — combine up to 3 shelves
for 375 amp ultimate capacity and up to
60 bullet positions
nHot insertion capability — allows for
system expansion without disruption
nEquipped for dedicated input feed per
module and dual input feed per shelf –
isolated input to output
nSafety compliance — NEBS Certified; UL
recognized
Standard Features
nConverter MINOR alarm
nConverter MAJOR alarm
DC-DC Converter Shelf
Description
The NetSure® DCS 48375 modular DC to DC converter shelf provides up to 375 amps
at -48 volts DC via high frequency switch mode converters rated at 1500 watts (31.25
amps) each. The modular design allows the converter’s capacity to expand as your system
expands. Each DCS 48375 converter shelf can accept four individual, plug-in converter
modules per shelf that can be easily installed live without system interruption. Each
shelf provides 6000 watts (125A max) at -48VDC to -52VDC with 20 bullet positions (23"
mount) or 15 bullet positions (19" mount) in four rack units (7") of height.
Application
The NetSure® DCS 48375 converter shelf is compact and easy to expand, making it ideal
for +24 VDC wireless, cellular radio and microwave sites requiring -48 VDC output.
nFuse / CB alarm
nCurrent limiting
nOver-voltage protection
nOver-temperature protection
nLoad sharing for parallel operation
nEasily accessible input and output
connections for simplified installation
Ordering Information
Part Number
Model Number
Description
584622300
584622400
584622100
584622200
1C24481500
DCS48375
DCS48375
DCS48375
DCS48375
C24/48-1500
Main shelf, 23"
Expansion shelf, 23"
Main shelf, 19"
Expansion shelf,19"
NetSure® DC/DC converter module
nTest points for output current and
voltage measurement
nEmergency power off
143D-NSDCS375 / 0912
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NetSure® DCS 48375
Specifications
Input
Voltage
Current
Circuit Protection
Filtering
Efficiency
Output
Voltage
Current
Regulation
Dynamic Response
Filtering
Protection
Overvoltage
Overcurrent
Over Temperature
1500 Watt Converter Module
24.0 volts DC nominal, with range of 20.5 to 30.0 volts DC
83.3 amps maximum (at full load for one module, 21VDC input)
Fuse is located in the positive input lead of each converter module
Noise reflected back to the battery is less than 32dBrnC and is within the parameters set
forth in Telcordia technical reference TR-TSY-000009, using test measurements in
PUB43802, pages 5 and 6
90.8% typical
-48.0 VDC, -50.0 VDC, -52.0 VDC and -54.0 VDC selectable
31.25 amps per DC-DC converter module, up to a total of 125 amps per shelf
with four modules installed.
Steady state output voltage remains within ±1% of the pre-adjusted voltage for any load current from no load to full load and over the specified input voltage range
For a step load change within the range of 20% to 100% of full rated current, the maximum
voltage transient will not exceed 5% of the initial steady state voltage
Voice band noise is less than 32dBrnC. Wide band noise does not exceed 250 mV peak to
peak over the frequency range of 0 to 100 MHz. Wide band noise does not exceed 50 mV
rms over the frequency range of 0 Hz to 100 MHz.
Each DC-DC converter module will automatically shut down and lock out should its output
voltage exceed 115% to 125% of nominal voltage. Manual restart is necessary after the overvoltage condition is corrected.
When the output current of a DC-DC converter module increases to a preset value between
102.5% to 115% of rated full load, the output voltage of the module will automatically
decrease to limit current to this value. The output will recover to within specified limits when
the overload condition is removed.
Each DC-DC converter module will automatically shut down if the internal temperature of
the module exceeds a predetermined value. Operation will automatically resume after the
over-temperature condition is removed.
Status/Alarm Indicators
Minor alarm LED (yellow) and form-C contact for a single DC-DC converter module failure
Shelf
Major alarm LED (red) and form-C contact for two or more DC-DC converter module failures
Input OK LED (green) if the input voltage source is within operating limits
Fuse alarm (red) and form-C contact if any GMT load fuse opens
E Stop RTN signal will shut down all converter modules
Test points for output current and output voltage
Module
Output OK LED (green) if output voltage is between the low and high voltage alarm limits
and fan is operating normally.
Environmental
Operating Temperature
Storage Temperature
Humidity
Altitude
Audible Noise
EMI/RFI Suppression
-40°C to +65°C (-40°F to +149°F), power derated to 80% at 65°C (149°F)
-40°C to +85°C (-40°F to +185°F)
0% to 95% relative humidity, non-condensing
Maximum operating ambient temperature should be derated linearly
(3°C per 1000 ft.) at elevation above 5000 ft.
The audible noise at any point 2 ft. from any vertical surface of the shelf shall not exceed
60dB-A per ANSI S1.4.
This unit conforms to the requirements of FCC Part 15, Subpart B, Class B; EN55022, Class B
for radiated and conducted noise; and GR-1089 CORE for conducted noise.
EmersonNetworkPower.com/EnergySystems (North America)
EmersonNetworkPower.eu/EnergySystems (EMEA)
© Emerson Network Power Energy Systems North America 2012.
Business-Critical Continuity™, Emerson Network Power™, the Emerson Network Power logo, Emerson® and Consider it Solved are service marks and trademarks of Emerson
Electric Co. EnergyMaster ™, eSure™, NetPerform™, NetReach™, NetSpan™, NetSure® and NetXtend™ are trademarks of Emerson Network Power Energy Systems North America.
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